基于数字微波GRRU系统的数据压缩算法的研究

摘要

n order to improve the transmission ability of GRRU, Combined with the feature of GSM signals, designs a compression algorithm based on ADPCM algorithm with a 2:1 compression ratio ,and study the error sensitivity of the algorithm, analysis the causes of error propagation and proposes a solution, and finally simulates the ADPCM algorithm in matlab with the source of the GSM signal which has experienced the digital IF disposing, the EVM indicators calculated is 0.8731% after decoded, which meets the sensitivity requirements of the follow-up receiver.%为了提高数字微波GRRU系统的传输能力,结合GSM信号的特点,设计了一种基于ADPCM算法的压缩比为2∶1的压缩算法.研究了该算法对误码的敏感度,分析了误码扩散产生的原因,并提出了解决方法.以经数字中频处理后的GSM信号为信号源,在matlab中仿真了该算法,解码后计算出的EVM指标为0.8731％,满足后续接收机的灵敏度要求.